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Emerson Climate Technologies
15
Electronic Valves & Controls
Emerson Climate Technologies
Electronic Valve Applications
Valves can be used for a variety of applications:
• Expansion valves
• Capacity control valves
– Hot gas bypass
– Controlled by temperature
or pressure
• Evaporator pressure regulator
– Controlled by temperature
or pressure
• Liquid injection – oil cooling
– Desuperheating In screw compressors
• Liquid level control
– Flooded evaporator
• Crankcase pressure regulator
• Head pressure control
Electronic Valves – Introduction
Thermostatic expansion valves and mechanical
regulator valves have been used in the refrigeration and
air conditioning industry to control superheat and refrig-
erant mass ow since the very beginning. As today’s
systems require improved energy efciency, tighter
temperature control, wider range of operating conditions
and incorporate new features like remote monitoring
and diagnostics, the application of electronically oper-
ated valves becomes mandatory. These valves offer the
control performance necessary to meet these needs.
As more new refrigerants appear on the market
requiring an ever increasing number of different charges
and settings for thermostatic expansion valves, electri-
cal control valves can work with all refrigerants.
Advantages of Electronic Solution
• Wide operating range
– Fewer valves to cover the entire capacity and
refrigerant range
• Energy savings
– Allows oating head pressures and provides
tighter superheat control
• Suitable for higher pressure refrigerants
(R-410A and CO
2
)
• Diagnostics and remote monitoring capabilities
- Technical 1
- Help Guide 1
- Introduction 3
- Table of Contents 4
- Thermal Expansion 5
- Thermal Expansion Valves 6
- Internal Equalizer 6
- Factory Settings of TXVs 7
- External Equalizer 7
- Superheat 9
- Approximate Methods 9
- Superheat Adjustment 9
- TXV Selection 10
- Application Tips 11
- Remote Bulb Well 11
- Remote Bulb Location 11
- Operation at Reduced Capacity 12
- Gas & Gas Cross-Charges 14
- Which Charge to Use? 14
- Adsorption Charges 14
- Liquid Cross-Charges 14
- Other TXV Considerations 15
- Refrigerant Code Names 16
- Emerson MOP 16
- TXV Charge Code Selector 17
- Electronic Valves 18
- & Controls 18
- Electronic Valve Applications 19
- Emerson Climate Technologies 20
- EC3-32 and EC3-33 Systems 20
- Temperature Sensor ECN-N60 20
- Pressure Transmitter – PT4 21
- TXV Controller – EC3-X32 21
- TXV Controller – EC3-X33 22
- Universal Driver – EXD-U00 22
- XEV22 Superheat Controller 22
- Electrical Control Valve – EX 23
- Third Party Controller 23
- Electronic Valves Programming 24
- Solenoid Valves 25
- What Are Solenoid Valves? 26
- 2. Pilot Operated Valve 27
- Types of Solenoids 27
- 2-Way Valves 27
- Solenoid Valve Selection 28
- Application Overview 29
- System Protectors 30
- Absorption vs. Adsorption 32
- Types of Filter driers 32
- Dirt, Waxes, Acid 32
- Sightglass 33
- Suction Filter Driers 34
- Internal Design 35
- Compressor Burnout 36
- Filter Driers for Heat Pumps 37
- Removing Contaminants 37
- One-Way Flow, Both Directions 37
- Simplifying While Servicing 38
- Emerson System Protectors 38
- Regulators 39
- EVAPORATOR 40
- INTERMEDIATE 40
- Figure 3: EPRB(S) Brass Body 41
- (Emerson EPRB) 42
- HeadMaster HP Operation 43
- solenoid VAlVe 46
- Figure 8 47
- Adjusting the Set Point 48
- Oil Controls 49
- Emerson Oil Controls 50
- Temperature 51
- Pressure Controls 51
- Temperature Pressure Controls 52
- TS1 Introduction 52
- Housing Variants 52
- Temperature Sensing 52
- Setpoints 53
- Electrical Contacts 53
- Contact Function 53
- PSC Pressure Switch 56
- PSC Introduction 56
- FSX Introduction 57
- Basic Rules of 58
- Good Practice 58
- Basic Rules of Good Practice 59
- Troubleshooting 61
- SYSTEM TROUBLESHOOTING GUIDE 62
- No Superheat At Start Up Only 63
- Superheat Is Erratic Or Hunts 63
- Troubleshooting Ball Valves 68
- Troubleshooting Regulators 69
- R404A/R507A 70
- Wholesaler/Contractor Support 72
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